Saw-stretching-machine attachment.



V G. R. SPRAGUB. SAW STRE'IGHING MACHINE ATTACHMENT.

APPLICATION FILED AUG. 27, 1912.

Patented Feb. 25, 1913.

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C. R. SPRAGUE.

SAW STRE'IGHING MAGHINE ATTACHMENT.

APPLICATION FILED AUG. 27, 1912.

4 1,054,367. Patented Feb. 25, 1913.

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CLARE R.

SPRAGUE, OF VERDI,

NEVADA.

SAW-STRETCHING-MACHINE ATTACHMENT.

To all whom it may concern.

Be it known that I, CLARE It. SPRAGUE, a citizen of the United States,residing at Verdi, in the county of l/Vashoe and State of Nevada, haveinvented certain new and useful Improvements in Saw-Stretehing-lVlachineAttachn'lents, of which the following is a specification.

My invention relates to new and useful improvements in machines forstretching band saws, and has particular reference to an attachment tobe used .in connection with such machines for taking the dish ortransverse curve or warp out of such band saws while they are beingstretched.

An important object. of my invention is to provide an attachment of theabove men-' tioned character, which may be secured to a band sawstretching machine without materially altering its construction.

A further object of the invention is to provide a device of the abovementioned character, which is simple in construction, cheap tomanufacture, and durable.

Other objects and advantages of the invention will be apparent duringthe course of the following description.

In the accompanying drawings forming a part of this specification and inwhich like numerals are employed to designate like parts throughout thesame, Figure 1 a side View of a band saw stretching machine, showing myattachment applied thereto, Fig. 2 is a plan View of the same, the uppercross piece being omitted, Fig. 3 is a transverse vertical sectional.view taken on line 33 of Fig. 1, Fig. 4-

a central vertical longitudinal sectional view taken through themachine, parts being broken away, and, Fig. 5 is a perspective view ofmy attachment.

In the drawings wherein for the purpose of illustration, I have shown apreferred embodiment of my invention, the numeral (3 designates apedestal upon which is mounted a horizontal support 7.

The numeral 8 designates a swinging transverse piece or head, pivotallyconnected at one end with upstanding brackets 9.

Pivotally connected with the support 7 is a swinging latch 10, adaptedto receive one end of the transverse piece 8 and provided with clampingmeans 11 to engage the same.

Suitably mounted upon the support 7 is a Specification of LettersPatent.

Application filed August 27, 1912.

Patented Feb. 25, 1913. Serial No. 717,289.

base 12, provided with a recess 13, as shown in Fig. 4, for receiving alower roller 14, which is driven by a shaft 15. This shaft receives itsrotation from a pulley 16 or the like.

Disposed above the lower roller 1.4 is a vertically adjustable forkedbearing 17 carrying a shank 18, which is mounted to reciprocate within asocket 19 formed in the transverse piece or head 8, as shown. The forkedbearing 17 carries an upper roller 20, adapted to be moved into and outof engagement with the roller 1 1. The vertical movement of the bearing17 is effected by a screw 21, having engagement with the shank 1S.Itigidly connected with this screw is a handle 22. It is thus seen thatby turning the handle 22 the bearing 17 will be raised and lowered.

.lt is thought that the above description of the machine should sufliceas no claim is made to the same per 86.

My invention particularly resides in the provision of an attachment 23,which is placed over and about the lower roller 14. This attachn'ientcomprises an upper horizontal flat body portion 24, supported by endpieces or legs 25, as shown. One of these legs is provided at its lowerend with a horizontal extension 26, having a screwthreaded opening 27formed therethrough to receive an adjusting bolt 28. The other legs 25have apertured ears or extensions 29 formed thereon, for receivingscrews or bolts 30, which serve to pivotally connect this end of theattachment to the base 12, holding the same from displacement andallowing the opposite end of the device to be raised and lowered byproper manipulation of the bolt 28, it being understood that the bolt 28has no screw-threaded engagement with the base 12 but simply has itsfree end bearing against the same. The horizontal body portion 2 1 isprovided with an opening 31 formed therethrough and extendinglongitudinally of the same. This opening also extends through a portionof the legs 25 which are adjacent the horizontal extension 26, as shown.As clearly shown in Figs. 1, 2 and l, the attachment 23 is placed overand about the lower roller 14 and is parallel to the plane of rotationof said roller. The body portion 24 of the attachment is suitably spacedfrom the lower roller and the distance between the same and said rollermay be varied by manipulation of the bolt 28, depending upon the degreeof dish or transverse curve which the saw has.

The operation of the device is as follows :-A band saw 32 is placed uponthe attachment 23, as shown in Fig. 4;. These band saws ordinarilyacquire, when in use, an outward curve or dish, as shown in Fig. 4. Thehandle 22 is now turned to bring the upper roller 20 down intoengagement with the band saw 32, which band saw is in turn brought intoengagement with. the lower roller 14. The proper degree of pressurebeing obtained between the two rollers and the band saw, said band sawwill be slowly fed between said rollers, since the lower roller 1a isslowly rotated by the shaft 15. The rollers 14: and 20 stretch the saw,as is well known, and my attachment will atthe same time take out thetransverse curve or dish. The dotted lines in Fig. 4i show the positionassumed by the saw when the two rollers are in engagement therewith.

It is to be understood that the form of my invention herewith shown anddescribed is to be taken as a preferred example of the same and thatcertain changes in the shape, size, and arrangement of parts may beresorted to without departing from the spirit of the invention asdefined by the subjoined claims.

Having thus described my invention, I claim 2- 1. The combination with aband saw stretching machine, comprising asupporting structure, a roller,a second co-acting roller, and means to move the second roller towardand away from the first named roller, of a device to be placed about thefirst named roller to hold portions of the band saw spaced from saidfirst named roller and having an opening formed therein for the passageof the second roller, whereby the central portion of the band saw may beforced downwardly through the opening into engagement with the firstnamed roller.

2. The combination with a machine, comprising a supporting structure, alower roller, an upper roller, and means to vertically move the upperroller, of an attachment to be disposed adjacent the lower roller,comprising an upper body portion provided with an opening, and means tohold said body portion at a suitably spaced distance above the lowerroller.

8. The combination with a machine, comprising a supporting structure, alower roller, an upper roller, and means to vertically move the upperroller, of an attachment to be disposed adjacent the lower roller,comprising an upper body portion provided with an opening, andadjustablemeans to hold the body portion in adjustment at difi'erentspaced distances above the lower roller.

l. In means of the character described, the combination with a roller,of a device to be mounted near the roller and adapted to retain thelongitudinal edges of a saw spaced from the roller and permit thecentral longitudinal portion of the saw to be moved into engagement withthe roller whereby will be transversely curved, and means to .move thecentral portion of the saw into engagement with the roller.

5. As an article of manufacture, an atthe saw tachment to be disposed incooperative relation with the roller of a band saw stretching machine,comprising an inverted approximately U-shaped frame having a horizontalbody portion to be disposed at a suitable distance above the roller andprovided with a large opening formed therethrough, said horizontal bodyport-ion adapted to normally hold the band saw spaced from the rollerand cause the same to be transversely curved when forced into engagementwith the roller.

In testimony whereof I affix my signature in presence oi two witnesses.

CLARE R. SPRAGUE.

Vitnesses F. E. VVALKER, 0. WV. BRYAN.

Copies of this patent may he obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). G.

